JPH0970757A - Dressing method of double end surface grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the dressing work of a stepped grinding wheel face and simplify a dresser. SOLUTION: It is a dress method of a double end surface grinding machine in which each opposing face of a pair of rotary grinding wheel which oppose to the axial direction consists of a grinding wheel face 43 on outer peripheral side and a grinding wheel face 44 on inner circumferential side which overhangs on a mating grinding wheel side from the grinding wheel face 43 on outer peripheral side through a stepped section 45 and which dresses by a dresser which reciprocates in parallel with the grinding wheel face between opposing grinding wheel faces. A single stone dresser 8 having one single stone tool for each grinding wheel on both sides in the axial direction is used as the dresser. By reciprocating the single stone dresser 8 in a section from an outside position in the radial direction to a stepped position, the grinding wheel face 43 on outer peripheral side is dressed, and then both grinding wheel are moved in the axial direction in the direction in which they come apart by a distance which is equivalent to the amount of a predetermined difference in steps. After that, by reciprocating the single stone dresser 8 in a section between the stepped position to a grinding wheel central part position, the grinding wheel on inner circumferential side is dressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dressing a grindstone of a double-sided surface grinder having stepped opposed grindstone surfaces.

[0002]

2. Description of the Related Art FIG. 12 is a cross-sectional view of a conventional dresser used for dressing a stepped grindstone surface. A pair of microbore diamond tools 51 are arranged on both sides of a dress arm 50 in the arm length direction. The protrusion amount of each diamond tool 51 is finely adjusted so as to have a height difference corresponding to a predetermined step amount d on each side.

Using such a two-stage compound stone dresser,
The outer peripheral side grindstone surface 43 and the inner peripheral side grindstone surface 44 of the stepped grindstone 4 as shown in FIG. 6 are simultaneously dressed. That is, the tool step d in FIG. 12 is adjusted to a predetermined step amount,
1, by swinging the dress arm 50 from the outer position P0 in the radial direction to the central position P2, the outer peripheral side grinding wheel surface 43 and the inner peripheral side grinding wheel surface 44 are simultaneously moved by the respective diamond tools 51. I'm dressing.

[0004]

In the conventional dressing method of the stepped grindstone surface by the two-step compound stone dresser, when the workpieces having different step differences are ground, the diamond tool 51 is adjusted in accordance with each step difference. Although it is necessary to finely adjust the height difference of the, the adjustment work is very time-consuming and troublesome.

Since one pair of left and right diamond tools, that is, a total of four tools 51, simultaneously dress four places, the load of the grindstone becomes very high, and the rigidity of the dress arm must be kept high. However, the dress arm itself becomes large in size, and a large amount of power is required to drive the dress arm.

An object of the invention of claim 1 of the present application is to perform dressing work for a stepped grindstone surface in a double-sided surface grinder.
A dresser equipped with a monolithic tool is intended to enable easy and accurate operation.

[0007]

In order to achieve the above object, the invention according to claim 1 is such that each facing surface of a pair of rotary grindstones facing in the axial direction has an outer peripheral side grindstone surface and the outer peripheral side grindstone. Consists of an inner peripheral side grinding wheel surface overhanging from the surface to the other grinding wheel side through a step portion, between the grinding wheel surfaces, in a dressing method of a double-sided surface grinder that dresses with a dresser that reciprocates parallel to the grinding wheel surface, As dressers, a single stone tool is provided on both sides of the dress arm, and the dresser is reciprocated between an outer position in the radial direction and an intermediate position corresponding to the step portion to dress the outer peripheral side grinding stone surface, and then a predetermined step. By moving the grindstones axially in a direction that separates them from each other by a distance corresponding to the amount, and then moving the single stone dresser back and forth from the intermediate position to the grindstone central position, the inner grinding wheel surface is dressed. It is characterized in that.

That is, by using a single-stone dresser and controlling the reciprocating range of the dress arm and the interval between both grindstone surfaces, the outer peripheral side grindstone surface and the inner peripheral side grindstone surface have a predetermined step amount. Dress in order.

[0009]

1 is a plan view of a double-sided surface grinder to which the present invention is applied, in which a pair of left and right grindstones 2 are provided on a column 1, and each grindstone 2 is rotatable and A rotary spindle 3 is supported so as to be movable in the axial direction, and a pair of rotary grindstones 4 facing each other in the axial direction are detachably fixed to flange portions 3a provided at opposite ends of the rotary spindles 3, respectively. There is.

On the front side of the grindstone 4, a rotary work carrier 6 passing between the grindstones 4 is arranged, and on the rear side of the grindstone 4,
A single stone dresser 8 is arranged.

FIG. 3 is a vertical cross-sectional view of the grindstone base 2. Inside the grindstone mount 2, a slide case 12 is arranged so as to be axially movable and non-rotatable. The rotating main shaft 3 is rotatably supported, and the rotating main shaft 3 is axially fixed to the slide case 12,
It is configured to move in the axial direction integrally with the slide case 12.

The axial end portion of the rotary main shaft 3 is connected to a drive pulley 16 via a spline engagement type expansion joint mechanism 15, and the drive pulley 16 is connected to a drive belt (not shown) via a transmission belt 17 or the like. Connected to.

A ball screw mechanism 20 for axially moving the slide case 12 is disposed below the slide case 12. The ball screw mechanism 20 includes a ball screw 21 rotatably supported in parallel with the rotary main shaft 3 and the ball screw 2
1 and a ball nut 22 axially coupled to the slide case 12 by a coupling key 23.

In FIG. 4, the wheel gear 24 fixed to the end of the ball screw 21 meshes with the lower worm shaft 25, and a manual handle 27 is fixed to one end of the worm shaft 25 and the other end thereof. A servo motor 26 is interlockingly connected to the above through a joint. The ball nut 22 is non-rotatably supported like the slide case 12, and by rotating the ball screw 21 by the servo motor 26, the slide case 12 and the rotary main shaft 3 are axially moved integrally with the ball nut 22. It is supposed to do.

FIG. 5 is a vertical cross-sectional view of the single stone dresser 8. A dress arm 33 is fixed to a swing shaft 32 supported by a pair of left and right bearing bases 30 via bearings 31, and the dress arm 33 is provided. The diamond tools 7 are respectively fitted and supported in a pair of left and right cylindrical holders 36 provided at the tip end of the, and fixed by a lock bolt 40 so that the protrusion amount can be adjusted.

A swing angle detection mechanism 29 is provided at one end of the swing shaft 32 and is connected to a controller (not shown). A wheel gear 41 is fixed to the other end of the swing shaft 32, and is interlocked with a servo motor 39 shown in FIG. 1 via a worm shaft 42 meshing with the wheel gear 41. The servo motor 39 is connected to a controller, According to an instruction from the controller, control is performed so as to operate at a predetermined number of swings, a swing interval, a swing speed, and a swing range.

In FIG. 6, the facing surface of the rotary grindstone 4 is an outer peripheral side grindstone surface 43, and an annular groove 46 from the outer peripheral side grindstone surface 43.
2 and the inner peripheral side grindstone surface 44 protruding to the mating grindstone side through the step portion 45, and as shown in FIG. 2, both end surfaces of a connecting rod or the like having a stepped end surface are simultaneously ground as the grinding work W. Used to.

A method of dressing a stepped grindstone according to the present invention by the above-mentioned single stone dresser 8 will be described.

In FIG. 6, first, the outer peripheral side grinding wheel surfaces 43
Both the outer peripheral side grindstone surfaces 43 are axially approached to the position where the total cutting amount or one cutting amount can be secured.

In this state, the two grindstones 4 are rotated to reciprocally swing the dress arm 33 shown in FIG. 2 between the external position P0 and the intermediate position P1 corresponding to the annular groove 46 of the step portion 45. The grindstone surface 43 is dressed flat. The number of reciprocations of the dress arm 33 is, for example, three times as shown in FIG.

As described above, the entire cutting amount of the outer peripheral side grinding wheel surface 43 of FIG. 6 is secured from the beginning, and in that state, the dress arm 3
In addition to the method of reciprocating 3 times several times, for example, the cutting amount is divided into several times, first approached to the position where the first cutting amount is secured, and each time the dressing arm 33 reciprocates, a small amount of cutting is sequentially performed. There is also a method of cutting to the full depth of cut.

After dressing the grindstone surface 43 on the outer peripheral side, as shown in FIG. 7, both rotary grindstones 4 are moved in a direction in which they are separated from each other by a predetermined step amount d (or a predetermined step amount + a minute amount),
In this state, as shown in FIG. 8, the dressing arm 33 is reciprocated several times between the intermediate position P1 and the central position P2, thereby dressing the inner peripheral side grinding wheel surface 44.

In this case, when the predetermined step amount d is first moved at a time, the dress arm 33 is reciprocated several times while maintaining the position.

When the step amount d + a minute amount is to be moved, the cuts are sequentially made for each reciprocation, and finally cut to a predetermined cut amount to secure a predetermined step amount.

The above series of steps can be applied either automatically, semi-automatically or manually. In the case of automatic, as shown in FIG. 9, an outer peripheral side grinding wheel surface position adjusting step S1, an outer peripheral side grinding wheel surface dressing step by reciprocating motion between an external position and an intermediate position, a step amount adjusting step S2, and an intermediate position and a center. This is to sequentially and automatically control the dressing process on the inner circumference side between the parts and the positions.

In the case of semi-automatic operation, the outer peripheral side grinding wheel surface position adjusting step S1 and the step amount adjusting step S2 are manually performed, and the outer peripheral side grinding wheel surface dressing step and the inner peripheral side grinding wheel surface dressing step are automatically performed.

In the case of manual operation, all the above steps are performed manually.

Needless to say, the single-stone dresser 8 itself can be applied to mere dressing of a parallel grindstone surface having no step.

[0029]

As described above, according to the present invention,
By controlling the reciprocating range of the reciprocating motion by the single stone tool 7 and adjusting the step difference by adjusting the axial movement of the rotating grindstone itself, the facing grindstone surface with the step is dressed, so that the workpieces with different step differences are ground. In case of
There is no need to perform the troublesome work of finely adjusting the height difference of each diamond tool, etc., as compared to the case of simultaneously dressing both the inner and outer whetstone surfaces using a stepped compound stone tool, and a stepped whetstone with various steps On the other hand, setup change and dressing work can be performed easily.

Since the outer peripheral side grindstone surface and the inner peripheral side grindstone surface are dressed separately and in order by a single stone tool,
Compared with the method of simultaneously dressing both the inner and outer whetstone surfaces using the two-step compound stone dresser, the load on the dressing arm from the whetstone can be reduced. Therefore,
The motor for driving the dress arm can be downsized, and it is not necessary to increase the rigidity of the dress arm itself.

[Brief description of drawings]

FIG. 1 is a plan view of a double-sided surface grinder for carrying out the present invention.

2 is an enlarged cross-sectional view taken along the line II-II of FIG.

FIG. 3 is an enlarged cross-sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is an enlarged vertical sectional view of the dresser.

FIG. 6 is a vertical cross-sectional view of a grindstone showing a dressing process on the outer peripheral grindstone surface.

FIG. 7 is a vertical cross-sectional view of a grindstone showing a grindstone surface interval adjusting step.

FIG. 8 is a vertical cross-sectional view of a grindstone showing a dressing process of the inner peripheral side grindstone surface.

FIG. 9 is an operation trajectory of a tool in a fully automatic dressing work.

FIG. 10 is an operation trajectory of a tool in a semi-automatic dressing work.

FIG. 11 is a side view of a dresser showing a conventional method.

12 is a sectional view taken along line XII-XII of FIG.

[Explanation of symbols]

 3 Rotating Spindle 7 Single Stone Tool 8 Single Stone Dresser 33 Dress Arm 43 Outer Side Grinding Wheel Surface 44 Inner Side Grinding Wheel Surface 45 Steps 46 Annular Groove

Claims (1)

[Claims] 1. A pair of rotating grindstones facing each other in the axial direction are provided with an outer peripheral grindstone surface and an inner peripheral grindstone surface protruding from the outer peripheral grindstone surface to a mating grindstone side via a step portion. In the dressing method of the double-sided surface grinder that dresses between the whetstone surfaces by the dresser that reciprocates parallel to the whetstone surface, the dresser is provided with single-stone tools on both sides of the dressing arm, and the dresser has a diameter of By reciprocating between the outer position and the intermediate position corresponding to the step, the outer peripheral side grinding wheel surface is dressed, and then both grinding wheels are moved in the axial direction in a direction away from each other by a distance corresponding to a predetermined step amount. ,
After that, the dressing method for the double-sided surface grinder is characterized by dressing the inner peripheral side grinding wheel surface by reciprocating the single stone dresser from the intermediate position to the central position of the grinding stone.